This tonal mess doesn't work
The plot is pretty simplistic, it should be possible to make an entertaining popcorn romp out of it.
The thing is, this movie doesn't quite gel, so it doesn't work.
First problem is the casting; not only are the three stars WAY too big on their own to form a coherent, harmonious group - they are more like cell phone towers that, if placed in a certain proximity, will diminish each other's signal - but the villains are WAY, way too sympathetic, so you actually mourn when they die.
Why did they have to cast Alfonso Arau as the main villain, when we already have sympathy for his villainy in Romancing the Stone as the Joan Wilder-fan, 'Juan the smuggler'?
Aww, he can't even drive over his favorite pig, and is proud of his village to the point of wanting to show complete strangers where his mother was born. How can you hate someone like that?
Then you have his friendly, likable charisma in this movie, all smily and loving a sweater and not even RPGRGhring the girl (so unrealistic, but whatever - I mean, this guy has NO QUALMS about shooting men he has never met in the shoulder, dynamiting a village, exploding houses and even RRPGHRing horses, but suddenly stops at a girl he lusts, and does .. nothing. Not even groping or whatnot. I mean, the hollyweird hypocrisy is very strong with this kind of stuff, they want you to think someone is the nastiest nazzy villain ever, but then he won't even dare touch a woman without her absolute consent)..
..how are we supposed to feel when he even has a sense of humor about 5 seconds before he dies? Are we supposed to feel glad he died? I wanted to see more of him.
Just because they put 'dirty teeth' make-up on him and the others, doesn't make them 'rotten' enough for the audience to hate them. HOW SYMPATHETIC is his right-hand man? That actor is just so adorable, I want to be his friend forever and forgive him for his crimes (even though I would never, ever condone doing anything like that).
I mean, he has real humanity and sympathy to him, and they show WAY too many good, relatable conversations with him and El Guapo. Guapo may be crazy and evil, but he's also relatable and likable, and I especially love the whole 'plethora' thing - how many of us just HAD to research 'plethora etymology' after this movie (or during)?
He should've asked 'what does plethora mean' instead of stating 'yeah, you have a plethora', but whatever.
So, we have main stars you can't even take seriously because they act SO weirdly and unrealistically, plus they are enormously huge stars you can't really see as a group, all of them have AMAZING solo movies (Innerspace, Planes, Trains & Automobiles, Fletch, to mention just a few).
The ending could have saved things, but it made things worse; the pathos always comes off as fake, but what COULD have saved the ending is, if everything else was the same, but this time, they had a lump in their throat, tears in their eyes and sincerity in their voice when they make those hollow, superficial, fake, learned, scripted speeches in the end, thus ending up ACTUALLY meaning them, that would've saved a lot.
But they didn't. It comes off JUST as plasticky and fake as it always did, they deliver fake speeches in fake voices and do rehearsed routines in a soulless, gimmicky way and that's the movie. They don't get the girls, they don't even get 'bedroom fun' as a reward (because of course, hollyweird can't touch the topic of 'sex' realistically, logically or in a way that men would ever benefit, and can't show cute, innocent-looking women as sexual beings, even though one scene with Chevy kinda hints at that kind of stuff)..
Not to mention the typical, stupid 'men have to do women's dirty work'-type misandry, that ruins the whole thing. Too many convenient coincidences, the boss being unrealistically dismissive of their STAR actors (they HAVE starred in movies, they WOULD have financially exploitable audiences, what the F? What businessman lets his ego get in the way of amassing a fortune??)..
The plot is linear, simple and overly done. At the time, maybe it was a bit novel, but if you have watched 'The Seven Samurai', or Eastwood's spaghetti westerns, this movie doesn't give you anything new. So many movies copied this movie's ridiculous plot afterwards, it makes my head spin - A Bug's Life, Galaxy Quest, etc. Just how many movies have to be made out of the premise of 'certain group of people do not understand what entertainment is'?
If the movie was a bit less wacky (singing horses suddenly, REALLY? WHAT?), it didn't tonally-shift so rapidly all over the place (cold blooded murders everywhere, then some over-the-top silly dance number, then worry for the village and serious female faces, then misunderstanding brings hilarity, then people are shot and buildings dynamited, horses scared and .. it's ALL OVER THE PLACE! You can NEVER know whether to take anything or anyone seriously or not - are the men in the bar scary tough guys or wimpy idiots?)..